Fix callmap for DOMNode methods

[tvdijen]

No description provided.

[orklah]

Hey! Can you rebase? The CI crashed somehow.

Would you have an example for lookupNamespaceUri taking null and returning null on strict_types? Seems different than the official doc

[tvdijen]

The docs are a total mess. Especially on the DOM-extension. For some reason they won't merge doc updates, so I gave up on that a long time ago.

Let me point you to the DOM specs:
https://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-lookupNamespaceURI

As well as the PHP source:
https://github.com/php/php-src/blob/master/ext/dom/node.c#L1513-L1518

Passing null to lookupNamespaceURI means to lookup the default namespace.
If no default namespace exists, this method will return null.

For lookupPrefix, if it cannot be found the method will return null.

[orklah]

That explanation will do just fine :) Thanks for the fix!